Rotary cutter



June 17, 1930.

Filed Dec. 20. 1926 Patented June 17, 1930 FRANK PfMILLnn, korMnnnvrniin, .PENNSYLVANIA Liao'riiiaa' currnn Y Application filedDecember 20, 19,26. Serial No.V l55,918. i'

This invention relates to tool holders and more particularly to a meansto secure the blades in place in such a manner that end or other thrustthereon is eliectivelyj re-y sist-ed.

Another and equally important object is te provide a tool holder inwhich the blade tightening devices, which in this case, happen to be inthe nature of set screws are highly accessible for adjustment.

@ther objects and advantages will be apparent during the course ot thefollowing description.

Figure 1 is a sectional perspective of a cutter embodying the invention.

Figure 2 is a detail transverse sectional view through the same.

Figure 3 is a detail longitudinal sectional view through the cutter.

Figure 4l is a sectional view illustrating a slight modiiication of theinvention.

In the drawing wherein for the purpose 0i' illust-ration is shown apreferred embodiment of the invention the numeral 12 designat-es thebody of the cutter, which body is formed with an annular series oflongitudinal slots 14 for the reception. of blades 15 inspection ofFigure 2 will plainly show that the side walls of the slots and the sidewalls of vthe blades may converge toward the periphery of the body toinhibit radial movement of the blades when the same have been adjustedin the manner to be disclosed.

Attention is now invited to Figure 1 which illustrates that the body 12is centrally recessed as indicated at 9 to permit pressure screws 16 and17 to be threaded through previously formed radial openings in the body.Figure 3 clearly illustrates that the pressure screws 16 and 17 areadapted to have pressure engagementy with the inner edges of the bladesl5 so "that the bla( es are forced outwardly into binding engagementwith the converging side walls ofthe slots. v

t is important to note that the inner edge of each blade is extendedoutwardly to intersect the line of thrust on the blade. Thus the innerpressure screw 17 must be eX- tended outwardly a greater dist-ance thanthe pressure screw 16 to cooperate with the pressure screw 16 in formingan outwardly inclined bearing surface or seat for the blade 15. As'eachblade restsy on an ,outwardly inclined seat defined by the pressurescrews 16 and 17 endwise shifting` of the blade under the influence ofthe thrust thereon is avoided. ln explaining this Vit is pointed outthat in setting the blades the pressure screws are tightenedvto'causefthe blades to have iirm binding engagement with the side wallsof the slots so that radial movement of thel blades isinhibited. Theangular disposition of the seat for the blades positively i prevents theblades fro'mshifting endwise in one direction without movingoutwardlyand since such .outward movementis inhibited there' can'be no endwisemovement under the influence of the thrust. y

The particular means illustrated for holding the blades :in place arecapable ci ready adjustment and are also capable of being `quicklyreleased so that the blades may be detached or reset, all of which addsto the utility and acceptability of the cutter."

AIn the torni of invention illustrated in Figure-i shim or spacer lstrip20' maybe interposed between the inner edge of the blade and thekinclined seat dened Vby the spaced pressure screws'l and 17.

Having thus described the invention,

what is claimed is: n i

1. In a rotary cutter, a body having a slot provided with a bottom walland converging side walls,

a blade adjustable endwise in saidslotand havin@ an inner lon i- Ctudinal edgeet an angle to the opposed bottom wall of the slot, anadjustable abutment wedging means embodying pressure screws engaging theangularly disposed inner edge of the blade spaced points 'and forcingthe blade outward into binding engagement with the converging side wallsof the slot thereby cooperating with `said converging side walls ininhilitingendwise shifting of the blade. A

2. A rotary cutter comprising a centrally recessed annular body havingslots provided with converging side walls, blades adjustable in saitslots and having the inner lor Cil tudinal edges thereof inclinedoutwardly toward the rear ends of the blades, and pairs of pressurescrews threaded through said body and extending into said slots to formseats for said blades, one pressure screw of each pair being extended agreater distance into the slots than the other pressure screw of thatpair whereby the seats for the blades are inclined to cooperatewith'said converging side walls in inhibiting endwise shifting of theblades, said pressure screws being provided with heads positioned withinthe recessed portion of ysaid body.

V3. A rotary cutter comprising a centrally recessed annular body havingslots provided with converging side walls, blades adjustablelongitudinally in said slots, pairs of radially disposed pressure screwsthreadedy through said body and extending into said slots to form seatsfor said blades', one pressure screw of each pair being extended agreater distance into the slots than the other pressure screw of thatpair whereby the seats for the blades are inclined longitudinally tocooperate with said converging side walls in holding the blades in placeagainst the thrust thereon, said pressure screws being extended into thecentrally recessed portion of said body, and shims between said pressurescrews and said blades. Y

et. In a rotary cutter, a body having a slot provided with convergingside walls, a blade adjustable endwise in said slot and an innerlongitudinal edge at an angle to the bottom wall of the slot, pressurescrews extending into said slot and engaged at spaced points with theinner edge of said blade and forcing the blade outward into binding en-`gagement with the converging side walls of the slot thereby cooperatingwith said converging side walls in inhibiting endwise shifting of theblade under the influence of the thrust thereon, said pressure screwshaving threaded engagement with the body and being provided withseparately engagable heads.

5. In a rotary cutter, a body having a slot extending substantiallyparallel to the axis thereof, a blade adjustable endwise in said slotand having the inner edge thereof extended outward at an angle to theaxis of the body, pressure screws engaging said inner edge of said bladeat spaced points and forcing the blade outward, said side walls beingprovided with means limiting outward movement of the blade therebycooperating with said pressure screws in inhibiting longitudinalshifting of the blade in the directionV in which the blade is prone tomove under the influence of the thrust thereon.

6. In a. rotary cutter, a body having a slot provided with a bottom walland converging side walls, a blade adjustable endwise in said slot andhaving' an inner longitudinal of the blade under the infiuence of thethrust ,75

thereon. f f

In testimony whereof I affix my signature.

FRANK P. MILLER.

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